One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,11)(8,16)(9,13)(10,15)(12,17)(14,18)(19,20)(21,22)(23,32)(24,30)(25,36)(26,34)(27,31)(28,35)(29,33)(1,2,4,3)(21,23)(22,26)(24,25)(27,34)(28,36)(29,30)(31,32)(33,35)(5,7)(6,10)(8,14)(9,15)(11,13)(12,18)(16,19)(17,20)(21,24)(22,28)(23,33)(25,34)(26,29)(27,35)(30,31)(32,36) involution — undirected(5,7)(6,11)(8,14)(9,15)(10,13)(12,19)(16,18)(17,20)(21,25,27,33)(22,29,31,36)(23,24,34,35)(26,30,32,28)(1,3,4,2)(5,6)(7,10)(8,12)(9,13)(11,15)(14,18)(16,17)(19,20)(21,24)(22,30)(23,25)(26,29)(27,35)(28,31)(32,36)(33,34)(5,8,9,17)(6,12,13,16)(7,14,15,20)(10,18,11,19)(21,26)(22,23)(24,29)(25,30)(27,32)(28,33)(31,34)(35,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.